Carburetor



Jan. 13, 1931. A J HAMLlN v 1,788,914

CARBURETOR Filed Aug. 2o, 19,28 2 sheets-sheet -:L

ATTORNEY.

Jan. 13, 1931. A. .1. HAMLIN l 1,788,914

I CARBURETOR Filed Aug. 20, 1928 2 Sheets- Sheet 2 Fzjv.

INVENTOR. LFRED t HAMA/N.

A TTORNEY mmm 'Patented Jan;4 13, 1931 f UNITED y-sfleafrrf'zs' 1 ALFREDJ'. HAMLIN, Orl-Ventron, enmroniiin, ns'sieNon `'ro .ManniLosnNGnLEsoAmroRNiA si, yiinivitiiv, 'or

' CARBURETOR Application mednagustfeo, 11928. serial No. 300337;

vrlyhis linventiongas engines.V

. One Vof the objects lofthe invention is tcprovide `a'ca'rlouretorwhich will enable a gas j engine to attain a :higher running speed.

relates to carburetors for Another object 4of Vthe invention is toprovide ka Carburetor by 'means of which 'smoother running of agasengine in any gear and at any speed is 'effected l 1 Y: A 1U Another.ob'ect is lto providea carburetor which will enable a gas yengine to'.piek up"V or start more quickly.v 1

Another object. is to provideV a carburetor which will function in suchmanner as to 15 prevent killing or stalling of the engine. AnotherobJectis to provide a carburetor in which a variable idling jet isregulated by the engine choke. .Ag furtherobject-iswt-o provide acarburetor of the character stated 20 by means of Vwhich highereiiiciency ano greater economy' is attained. j v

Otherobjects and advantages will appear hereinafter. E

y The inventionis illustrated the an` annexed drawingswhichforr'n apart'of this specification and inwhlchf.

Fig. 1 is a side elevation of Fig. `8 isY a' fragmentary side viewiogtvthe' t;arb'ureto'rand the vchoke conn'eetions'to the' main air intakevalveoperating arm :andthe Yidling jet operating arm. e VFig. 9 is afragmentary transversejvertivcal section of the carburetor taken on line9-.9

of Fig. 5" showing the main air intake valve and the auxiliary airVintake valve. i

" Fig.. 10 is `a horizontal ,section of. the; idlingl*regulatingftheadmission of air intothe'jet.

the carburetor.`r Fig.' 2-is a sidefelevationioffthe carburetor v'takenfrom the side opposite to that shown in Y 30 Fig. l. v Y

upper end of the tube 14 'in the mixing cham- -jet'taken on line 10-10ofFig.' `showing the jet valve operating arin. y y f Correspondingreference characters refer f' to the .same parts throughoutythe severalviews. Y 5' *My carburetor eomprises'generally a iloat chamber 1, anidling jet 2, a mixing chainher `3, a main air intake valve 4 and anaux`ilia-ryrgair intake .Valvefin the lfront-end of' said mixingv hambfer, amain ,gas jet 6 in said mixing chamber,.a main jet; regulating valve 7,`a weighted mixture/,outlet valve 8 in said l:mixing chamberra butterflythrottle valve 9 the mixing ehamber outlet 10', and a. kick-out. valve11 controllingjan opening 12 inthe rear Iend of the mixing chamber.

The float Chamberl is providedwith an Vin-let 13 which connects with thegasoline supplylnotshownym The idling jet 2 fof myflcarburetor is of 70yvspecial design land construction, comprising generally a pair ofaligned-jetf tubes 14 and 15j, barrel 16 into whichthe ends'of saidItubes extend,V and an idlerjet valvev 17 vfor The tubeMV extendsupwardlyV from a point y near the bottom ofl the ioatchamber through thetopV of the chamber and through thelower f i end wall 18-of the barrelintoa mixing chamber 19 infthe lower rend ofthe barrel. The lower endofthe tube lext'ends downwardly vrthroug'rh a" threaded bore' 20 intheupper end of the barreljl-into the mixing chamber. 19

andsaidtubehas a thread 21 whichv engages Vthe thread of said threadedbore,v so that uponV 'l turning said' barrel in one direction ori-the .vother,the tube 15 will be moved axially in the barrel` whereby the lowerend of the tube will Y be adjusted closer to yQrffurther from the 9eber, as conditions require Vforvarying-the gas niixture. Alock nut'22screws on the upper tube thread 21 against'the upper end of thebarrel'for lockingthe tubeadjusted in the barrel. j The bore ofthe tubev141is restricted 95 at itsupper end at 23 and the bore of the tube 15 isrestricted jat its lower en d at 24. The barrel 16 is provided with airinlets 25 ,lead-` ing .intothe mixing chamberl). V.The valve l?comprises a sleeve26`turnablyfitted ir-rthV .109

sog-V lower end of the barrel and provided with air v inlet ports 27,whichports correspond in diameter at one endto the diameter of thevbarrelinlets 25, as indicated at 28, and taper from said end to pointsattheir other ends, as indieatedat 29, fo-r varyingk the admission ofair therethroughand through the inlets into the mixing chamber 19. 'Anoperatingv arm ,is adjustably clamped on thevalve sleeve 26 by^means ofYa clamp 31V yformedl on one end of the arm. The tube l5 leads into thecarburetor outlet 10 above the closed posi@ Ytion of the throttle valve4 as indicated at 32.A

In the mixing chamber 3 area seriesfof baille plates-33, 34, 35, 36, 37and 38-spaced progressively from the front end of the mixing chambertoward the rear end thereof, the rearmostplate 38 being spaced a shortdistance forwardly of theV rearY end wall'Y of the chamber forming therear portion of anoutlet passage 39 between the plate and said wall.Theibaflle plates 33 to 38 inclusive Vextend entirely across the mixingchamber and upwardly from the bottom` thereof to a horizontal wall 40which is vspaced below'the top wall ofthe Chamberzandforms'the remainingportion of the outlet passage 39, leading fromA the rear portion ofthepassagetothe throttle outlet l0. Afvertical partition 4l extendslongitudinally `of the mixing chamber midway thereof from the front end-wall of the Vchamber tothe first baille plate 33 and from the bottomolf-the chamber to the top thereof, the upper portion 'of the rear edge42 of said partition extending atan angle of` (45) up- I wardly from thefirst baille plate 33toithe substantially forty-five degreesintersection of the f front' wall- Vof the Vmixing chamber and the wallv40. l The partition 4() divides the .front end of the mixing chamberforwardly of thelirst baille plate 33 Vinto a main air' and-gasintakeehamber V43 and an v auxiliary air Vintakechamber 44, the main gasjet 6 being located in the chamber 43 and the valves 4 and 5 controlling`air Vinlets 45 and 46 in the front wall Vvof. the mixing chamv berleading into saidV chamber '43 vand 44 re! spectively. Thelowerhalfl'ofthebaffle plate 33 i'ssolid v'while .theV upperhalflthereof is perforated with openings-47 The upper half v'of thebaille plate 34 is solid-while the lower half thereof is fperforatedwithopenings 48v slightly smallerrthan the openings`47 lin the baiiie plate33;Y The lower half ofthe baffle plate35 is 'solidwhile'f the upper halfthereof is perforated with openings 49 slightly larger than the`openings48; The upper half'of the baille plateV 36 yis solid whilethe-lowerzhalf thereofis perforated with openings 50 slightly Vlargerthan Vthe openings 49. 'The lower half of the baflle plate` 37fisfsolid;whilefthe' f upper half thereof is perforatedwith openings 5'1,slightlylarger than the openings 50. The baffle plate'38 issolidrlandextends Aapproximatelyro'nly half 'the' distance fro-mfthe upper wall 40to the bottom of themixing chamber 3, leaving an outlet 52- between thelower edge of the plate and the bottom of the mixing chamber, whichoutlet is normally closed by the weighted mixture valve 8, which ishinged at its lower edge at 53 in the lower rear corner of the mixingvchamber 3 and carries a weight 54 which normally holds the kvalveclosed with its upper end againstva seat V55.on the lower edge of thebathe plate 38, but said valve is opened by the suction of the engine.

The main jet 6 `comprises a tube formed wlth a vertical-valve member 56,a horizontal member 57 extending from said vertical memberintermediateits ends and a jet mem? ber 58 extending upwardly from theend ofV said horizontal member, said jet'member vbe- 'through theadjoining walls of rthe float chamber and the mixing chamber 3, withythe jetj6 centrally disposed-in the gas and air chamber43 andimmediately below the center of the cholretube 60 which is 'secured inthe gas and air intake-chamber. The valve member 56 is formedwithavalve'seat 56 immediately below the horizontal member 57 and anscrewvalve 61 is threaded in the valve member 56 tofengagethe seat 6l forregulating the flow of gasoline from the float chamber through theV j et6 and the choke tube 60 into the mixing chamber, the upper end Vof thescrew valve extending .through the top of the Lfloat chamber whereit maybe engaged by a screw driver for regulating the Valve. Y fThe-Jet',regulat1ngvalve7 comprises a stem 62,/avalve head63 .on thelower end of the stem, a.Y valve tube 64, headsv 65 and 66 in the lowerand upper ends respectively of the tube, a'collar 67 on the stem, and aspring 68 surrounding the stem.` The `stem 62 ex `vtends through thetube 64 and the-heads 65 and66,`whi le the upper end ofthe'tub`e64 isscrew-seated at 69v inthe upper `wallzof the mixing chamber` and thebase iange 7 O'of the throttle. outlet casting in axial alignment withthe j et member 58.".V The spring 68 is interposedbetween the lower head)65 of the tube and the collar 67 andnormally holds the stein 62 andvalve head 63 elevated with said head above the jet seat 59, so thatgasoline lili) may beA introduced through the jet linto theY mixingchamber. Y l Y v v YMeans 7l are provided for closing the gas .jjet'6when the vthrottle' valve 9 is closed, which means comprises a-lever 72'hinged at 73 to the Vthrottle outlet casting, andan arm 74 secured ononeend of the throttle valve shaft e 75 Yand formed with a cam 76 vforengaging liz-emi@ Y* .,.saidilenen Oneendof theqleY-.er 72... bent bent.end.- YforE engaging .the .upper -end Qfsad .-stemvwhen the. leve- P172.-.`s Swungdfwnbyfthe engagement thereof by thefcam.Tffwhena the Adnwm; aga-instthetenSiQn Q-fxthe sli-.ring1 68,

:until the'valveheadr 63 see-te .0n t.. .59).ausili'Closes:*sadiet4 A.Set S52 Je .seat .79 iS seated.- in the-Guten end; .Oi the arm 74:;f0.1" engaging the throttle outlet 'liagigef-'L0 for Y limiting the@being .Qf/ the-fthottle #able A9- lary-j. am mieke-valve @are fiat.velve .hmeled swunglformrdly they 5111.desethe-alrlntak The airintakefvelvelind.the auxilat their; 19ml: ende reenatively en' Sheffs@iacent'theimm.andlowenwallslf.themx# ngf Chambon, so that` when;k saidvalves are f when swungibeC-kmdly- .All 31.82 saeesuned @MlleOuter.emlfQf-'thevalte Shaft' 8.9;;199 Awhich arm a isncenneted.,tliechok; rod 8.3.11; e Stud .Sefproiects from-911e Side-.edgeddosed-when; the alte 4i GlQSlz liu-tl the vallvee may be Openedwthoutopenmgrtxe valve end ofsaid spring;`v ngagee th. fen-189. The

A .Thek-ick-ont valveopening 12 isgjoi-.ovded leven et andsaidf atbetiis engage bf Seid' lenen to hol r;l..theE leven in. dijerentg pVwherelogythe.EenS1011 of the spring, Sil-:throngh oam89'lis {faniedtovaify-.the ieSSla-alleeatv thsuction ofthe-engine. y

whielthe auxiliary ainvalYe 5i is; opened; by

outside 'ofthe 'near enclfwallfoftlie mixing chamber 3.. Said; me. is@tmf-11m heid. lGlQSelby spifllgk 9.5 which is; Coliictd. at

1 elle endfQ-,the-upipe1 part Of tali@ filndgat itS etherendtothe,baeflange'l 0f. tllstbmta @emblema-ing.;

for; Opening and'.c1osr1gftl1e.L throttevelye..

link` 9.8 tothefchoke-rod'8.31; whereby the n-mportant .fatureofmyinvent-ion is 'the ConneQQn; of. the. idling jet' valve-@paf ating arm30, by any suitablemeansuch yas, a

is operatedgto close thelmain,intakel valve 4:

to introduce a ieh primingchargefinto-the engine manifoldt-hroughfthe'idling jet' and jet{aube-15,L i I The-'operation ofmyfcjanburetor: is es Vf0.1-

IOWS: ASSumng'thethrot-tle. valveQ-tQfQbe closed. and: the. main. jet 6Closedl byfthejet valyel 63,11pon pullingout lthe 'choke5 the `mainall@` Valve'. u41's. swung open Vby Ythe. ohoker'od Sandthe-.nalve-QGisturned also by'thecfhoke md, 'throughY theA .link 9.8, `so kthat.saldi valve4 If. the throttle .valveisleftalosel, the

will be. mixed inthemXng'ChambexB'or pass therefrom; but: airwlllbetaken into thegd'lng jet thnough. valve; inlet. ponts 29..:and.jet n- Chamber-- :Thegae passingfifomjthe float chamber through thedlingiet? aridE itsgtube 15; and; through. thecarbunetoroutlet. 1.0.; intothe'. engne-c-y1i11dene..wllsvstat' and. mm. the engine.r Byregulatingthe jet .Vaale 2.6." by mea-ns of the choke, so that jetinlets 25,. Will be Completely.; oitpartly openefLby-the valnablevalvefnletporlts 29, .themiXtu-pe 'of-gas fedinto the, engi-neandthe speed, of tlieenj gine. will aocording'lybe varied; 'lfh'epuri-v.olrgaseieeffeoted in. the mixingfhamber of is.: possible by meansofftfhe thread@ Cl.- engagemehtfoi'? the ll'alrel lttafllfd tuloe4ChokeJ is; eleased'falicl the engine started, the Gana., "7 6; W1-lllleleese l Leyen 72,. and the Splimg 58..v Q: till@ lllll glfS.. ]e.trValve willv raise the -jetvalve head 63. ofi-.its .Sea-.t faildfOPefi-ejet, wheeupen gasoline-will be, @lm-.Wn by @he emotion, of theengine-,fromme float chamber.

'.thrQilgllf. the iet.; into the. air intake' chamber 43, While airWillbeirawnthyoiighvtlieman 7 'aire-intake Qneemg paeiat-.hepnnlein .air Yintake. table 4,. into; Seidleininfke chamber and the gaselllef en@aewillmeand nass 'filttlef-Ouzglthe @helle t 10,860 then through web.

.the space between said'baiile plate-and 'bathe plate 3.4; thendownwardly through said space and throughthe perforations 48 in baiiieplate 34, into the space betweenbaflle plates 3e and 35; then upwardlyin said space and through the openings 49 inthe plate 35, into the spacebetweeiithel baiile'fplates `and 36;V then downwardly through said`space and through fil) the openings 50.inthe batle plate 36, into thespace betweenV the baffle plates 36 and `37;

then upwardly in said space and through the openings 51 in baffle plate37, into the space between the' battle plates 37 and 38; `thendownwardly in saidspace thrbughthe outlet 52, (the valve 8 being drawnopen by the suction :ofthe engine) andout through outlet passage 39f-andthe carburetor outlet 10 into the enginefor driving the engine v'in thevusual mannerwiththe throttle open. As the engine speeds upthe auxiliaryair valve 5 is opened by the greater suction'of thefengine and an'additional amount-of air passes first through the auxilialryarrintakechamber L14 arid=mixe`s withthe gas behind the inclined freared'ge'ofthe' partitionand then passes Vthrough the openings 47 tof-5land between the baiiie platesas above described andinixes with the gasdrawn'v through the V,mixing chamberfas above described.Thegasin-circulating between the baffle plates 33 and 34,

34" and 35, 3,5Yand 36,'36and 37,37 and 38,

and passing throughthe progressively smaller openings 4:7 to,5l-inclusive' in :saidbafle plates, is sothoroughly and finely mixed-asto'effectv most perfect and'complete combuster with the gasoline;atdi'erent levels inthe.

float Vchamber 1, I have provided means for regulating the level of thegasoline inthe .float chamber to accommodate the requirements 'of theengine. y I

To the floatV 100 of the fioat-l chamber-1 connectedan arm 101 whichispivoted' at l102` tothe upper'end of-a screw 103 whichex' tendsV throughthe lower wall Y of the float chamber in threaded engagement` therewith.

To the outer end of the arm jlOl is pivoteda needle valve 1, whiclislides intheiipper inner end of the inlet tube 13 of the chamber and isadapted toopen and closeports 105 y and to engage a seatVV 106 in saidtube and Vshut o the inflowof gasoline when it reaches a .predeterminedlevel-,in the chamberV as adjusted by the screw-103. s s

Having described my invention I claim;

y 1. In acarburetor, a mixing chamber provi ded withan airintakeopeningand'anoutlet7 an air intake valve controlling said opening, a'pluralityof baffle plates spaced between the front and rear endv walls of theVmixing chambenls'aid bafflev plates, exceptvthat `one nearthe rear endof the mixing chamber, beingl perforated, the perforationsdecreasi'ngxprogressively-in size` in the Vplates as spaced fromthefront towards the'rearbf themixing chamber, said mixing chamber fromthespace between the two rearmost baflleplates, to the carburetor outlet,and fa fuel nozzle in the Space between the front end wall of the mixingchamber and the first baille'plate. f A i Y,

`2. In a carburetor, armixing chamber provided withan air intake openingandan outv let, an airintake' valve controlling'said opening, avlfnluralityof baffle plates spaced between .Y the front andrearendwalls'of the mixing cliambersaid'bailleplates, except that onenearthe rear end of the mixing chamber,

beingperforated, the .perforations' decreas- 'being formed with anoutlet passage leading Y ino progressively `insize in the 'plates as Yspaced vfromjthe vfront 'towards the rear of the s mixing "chamber, saidmixing chamber V'being formed 'with'an outlet'passage leading from thespace between the v'two' rearmost baille plates, to the*carburetorVoutlet,av mixtu'i'egcontrol valvev in said passage normally closed-butcapable'o'f being opened by the suction ofthe engineyand a fuelv nozzleinthe spacebetween'thev front end wall of the mixing chamber and thefirst baille plate.v

' 3.1 InV a carburetor, a mixing chamber provided with a main'air intakeopening andan auxiliary air intake opening in the-'front end'- ywall ofsaid mixing chamber,'a mainA air intake valve 'controlling said mainairiintake opening, an auxiliary intake valve controlling 1 saidauxiliary intake opening, a plurality of baiile plates spaced betweenthefront and rear endrwall's of the mixing chamber,

said bailleplates,A except that'l :one nea-r4 the: VrearV end of *the*vmixing chamber,

' being Y perforated, the perforations decreasingprogressively in sizein the plates as j spaced from'the front towards the rear ofthemixing'chamber, a partition 'extending from thel front wall of lthe`mixing chamber .to the air intake chamber into which said mainair"intake opening andsaidl auxiliary ,air intake opening lead,"said mixingchamber being formed with ran joutlet passage leading from `the spacebetween the-two rearmostbaifle plates to the carburetor outlet, andv afuel nozzle in the mainair'intake chamber.

Q4. a carburetor@ mixing chamber proi' vided with an air intake openingvand an outlet, lan 'airi intake valve controlling said opening, faplurality of balfle plates' vspaced :first baffle plate and dividing thespaceinto ay main'V air intake .chamber andan auxiliary between thefront and rear endl walls of the l` mixing chamber, said baffle plates,except that vone near the` rear end of themixing chamber, beingperforated, the perforations decreasing progressively in size in theVplatesjas spaced from the front towards the rear of the mixing chamber,said mixing chamber being formed with an outlet passage leading from thespace between the two rearmost baiie plates to the carburetor outlet, amixture control valve' in' saidpassage normally closed but capable ofbeing opened bythe suction vof the engine, and a fuel nozzle in thespace between the frontv end wall of the mixing chamber and the firstba-ile plate, and alickout valve in said passage betweenv said mixtureVvalve and the carburetor outlet.

5. In a carburetor, a mixing chamber, a main air intakevalve and ahlnged auxlliary air valve, forl controlling the admission ofl air intosaid mixing chamber, a throttle valve Y for controlling the outlet ofmixture from said mixing chamber, and means for adjusting the resistance`against opening of said auxiliary air intake valve, said` resistanceadjusting means comprising a lever, a cam on said lever, a flat springconnected to the pivot of said hinged auxiliary valve and engaging saidcam, anda ratchet to be engage by said'lever to hold the'same and saidcam in dierent positions to adjust the tension of said spring. s f

6. In a carburetor, a ioat chamber, a mixing chamber provided with 'anoutlet, an Y idlingV bypass including a bypass mixing chamber, atubeextending from said iloat chamber into said bypass mixing chamber,

a second .tube extending from said bypass mixing chamber to thecarburetor outlet, means for adjusting the adjacent ends of said tubescloser together or. further apart within said bypass mixing chamber, andmeans operated by the choke for admitting air into said bypass mixingchamber.

ALFRED J. HAMLIN.

